Dental flask



(No Model.)

A. T. HAWLEY.

DENTAL FLASK.

N0.365,81-1. f Patented July 5, 1887.

UNITED STATES PATENT @rrrce.

ABRAM r. HAWLEY, or wArpnroRn, new roan.

DENTAL FLASK.

SPECIFICATION forming part of Letters Patent No. 365,811, dated July 5, 1887.

Application filed September 2, 1886. Serial No. 212,527. (No model.)

citizen of the United States, residing at W'aterford, in the county of Saratoga and State of New York, have invented a new and useful Improvement in Dental Flasks, of which the following is a specification.

My invention relates to an improvement'in dental flasks; and it consists in the peculiar construction and combination of devices that will be more fully. set forth hereinafter, and particularly pointed out in the claims.

In the drawings, Figure 1 is a perspective view of a dental flask embodying my improvement. Fig. 2 is a side elevation of the same, showing the flask placed in a press. Fig. 3 is a vertical section on the line it or of Fig. 1. Fig. 4 is a horizontal section taken on the line 3 3/ of Fig. 2. Fig. 5 is a detailed perspective view of one of the locking arms.

A represents a base-plate, which forms the bottom of the flask and is provided with three vertical posts, 13, on the inner edges of which,

near their upper ends, are cut horizontal grooves or recesses O.

D represents the lower section of the flask,

which is open at its upper and lower sides.

The said lower section is adapted to fit on the base-plate A and to bear against the inner sides of the posts B, and is provided with three pairs of horizontally-extending ears, E, on its outer sides, the spaces between which form recesses adapted to receive the inner edges or sides of the vertical posts, and thus securely fasten the lowerv section of the flask onto the base-plate. i

F represents the upper section of the flask,

which is open on its lower side and has its upper side closed, and the said upper section, F, is of corresponding size and shape with the lower section. From the lower side of the upper section, F, project horizontal ears G, the. spaces between which form recesses to receive the inner edges of the vertical posts B.

oted to the upper side of the top section. The outer ends of the lockingarms form inclined cams M, and immediately in rear of the said cams are vertically-projecting bosses N. The cams M are adapted to enter the recesses C of the vertical posts.

0 represents a press of the ordinary wellknown construction provided with a screw for forcing the'upper and lower sections of the flask together.

The operation of my invention is as follows: The mold is formed in thetwo sections of the flask in the usual manner, and the rubber is placed therein, and the sections of the flask are placed together by first inserting the lower section onto the baseplate between the vertical posts and then placing the upper section on the lower section, the ears of the said upper and lower sections engaging the posts, as before described. The screw of the press is then turned downwardly upon the boss H or offset on the upper side of the top section, and the said upper section is thereby forced firmly upon the lower section to bring the parts of the flask together. The dentist then with a small hammer strikes upon the bosses N of the lock:

ing-arms and forces the cams at the outer ends of the said lockingarms into the grooves or recesses on the inner sides of the vertical posts, thus firmly locking the sections'of the flask together. The pressure of the screw is then relieved from the flask and the latter is removed and the rubber therein subjected to the usual vulcanizing process.

Having thus described my invention, I claim- 1. In a dental flask, the combination of the.

posts B, projecting upward from the lower section, the upper section having the central off set, H, on its upper side, provided in its edges with recesses I, and the locking-arms having the inner ends seated in the recesses I and provided with downwardlyprojecting pivotal spindles L, journaled in openings in the top of the upper section, the said arms being adapted provided, the said lockiiigarms being pivoted and having the inclined earns at their outer to the upper section and having the inclined ends adapted to enter the recesses 1n the posts,

cams formed at their outer ends adapted to enter the recesses in the vertical posts, for the purpose set forth, substantially as described.

3. The combination, in a dental flask, of the base-plate having the vertical posts provided with the recesses O, the upper and lower sections of the flask having the recesses in their outer edges to receive the vertical posts, and the locking-arms pivoted on the upper section and also provided with the bosses N, for the purpose set forth, substantially as described. In testimony that I claim the foregoing as my own I have hereto affixed my signaturein presence of two witnesses. Y

ABRAM T. HAXVLEY. Witnesses S. G. BULL, F. F. FALLET. 

